package com.wolfalpha.utron.utils;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 线程池辅助类，整个应用程序就只有一个线程池去管理线程。 可以设置核心线程数、最大线程数、额外线程空状态生存时间，阻塞队列长度来优化线程池。
 * 下面的数据都是参考Android的AsynTask里的数据。
 *
 * @author zet
 */
public class ThreadPoolUtils {

    private ThreadPoolUtils() {

    }

    // 线程池核心线程数  
    private static int CORE_POOL_SIZE = 5;

    // 线程池最大线程数  
    private static int MAX_POOL_SIZE = 100;

    // 额外线程空状态生存时间  
    private static int KEEP_ALIVE_TIME = 10000;

    // 阻塞队列。当核心线程都被占用，且阻塞队列已满的情况下，才会开启额外线程。  
    private static BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<Runnable>(
            10);

    // 线程工厂  
    private static ThreadFactory threadFactory = new ThreadFactory() {
        private final AtomicInteger integer = new AtomicInteger();

        @Override
        public Thread newThread(Runnable r) {
            return new Thread(r, "myThreadPool thread:"
                    + integer.getAndIncrement());
        }
    };

    // 线程池  
    private static ThreadPoolExecutor threadPool;

    static {
        threadPool = new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_POOL_SIZE,
                KEEP_ALIVE_TIME, TimeUnit.SECONDS, workQueue, threadFactory);
    }

    /**
     * 从线程池中抽取线程，执行指定的Runnable对象
     *
     * @param runnable
     */
    public static void execute(Runnable runnable) {
        threadPool.execute(runnable);
    }

} 